# Proposed AD 2003-NE-35-AD: Pratt & Whitney Canada Models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G Turboprop Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2004-20-01
- Products: Pratt & Whitney
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: December 10, 2003, 68 FR 68802
- Comments due: February 9, 2004
- Became: [AD 2004-20-01](https://openairdocs.org/ad/2004-20-01)
- Docket: 2003-NE-35-AD
- FR document: 03-30587
- Official PDF: https://openairdocs.org/files/sha256/e3/57/e3576a850cbed8fa505f82cc48de00c35df4be0e46d67d7291ec570edbdd0ab7 (from https://www.govinfo.gov/content/pkg/FR-2003-12-10/pdf/03-30587.pdf)
- Federal Register: https://www.federalregister.gov/documents/2003/12/10/03-30587/airworthiness-directives-pratt-and-whitney-canada-models-pw123-pw123b-pw123c-pw123d-pw123e-pw123af
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3D225E119EC2BF886256DF8004E0473.0001
- Page: https://openairdocs.org/proposed/2003-NE-35-AD

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for Pratt & Whitney Canada (PWC) models PW123, PW123B, PW123C, PW123D, PW123E, PW123AF, PW124B, PW125B, PW126A, PW127, PW127E, PW127F, and PW127G turboprop engines. This proposed AD would require initial and repetitive gap inspections of the bypass valve cover, on certain part number (P/N) mechanical fuel controls (MFCs), and replacement of those MFCs as mandatory terminating action to the repetitive inspections. This proposed AD is prompted by sixteen reports of loss of engine throttle response and overspeed, eight of which resulted in in-flight shutdown. We are proposing this AD to prevent loss of throttle response and overspeed, resulting in engine in-flight shutdown.

## Notices in this docket

- Dec 10, 2003: Notice of proposed rulemaking (NPRM). (first notice), FR document 03-30587, comments due Feb 9, 2004 (https://www.federalregister.gov/documents/2003/12/10/03-30587/airworthiness-directives-pratt-and-whitney-canada-models-pw123-pw123b-pw123c-pw123d-pw123e-pw123af)

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